Riders in the amateur event were brought to a standstill just before midday as emergency services including the air ambulance were sent to the tough climb - at the highest hill in Surrey - on the route near Dorking.

Ambulance at Leith Hill (Photo: @martynsmarvels)

A RideLondon statement released on Sunday night said: "It is with deep sadness that we confirm the death of a participant in the Prudential RideLondon-Surrey 100 today.

"A 55 year-old-man collapsed on the lower part of the ascent of Leith Hill and, although he received immediate medical attention and an air ambulance attended, the death was confirmed at the scene.

"Our immediate concern is for the family of the deceased and no further details will be released at this time.

"We would like to express our sincere condolences to his family and friends."